Internal Combustion Engines
For the same compression ratio

Diesel cycle is more efficient than Otto
Both Otto and Diesel cycles are, equally efficient
Otto cycle is more efficient than the Diesel
Compression ratio has nothing to do with efficiency

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Internal Combustion Engines
Supercharging is the process of

Supplying compressed air to remove combustion products fully
Injecting excess fuel for raising more loads
Providing forced cooling air
Supplying the intake of an engine with air at a density greater than the density of the surrounding atmosphere

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